External processing.

I'm wondering if it is possible in XSL to call external processing. For
example, in a xsl:if function, I would like to add a self-defined function
to be evaluated in the test such <xsl:if test="myFooFunction($toto)">. I've
heard that it was possible in SGML. But the question is to do it in XSL, and
if possible, what parser would accept this?
?

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Simon Bécot 
Ingénieur développement Softeam - http://www.softeam.fr
<http://www.softeam.fr/>  -
- CNET Rennes - 
mailto:simon.becot@xxxxxxxxxx <mailto:simon.becot@xxxxxxxxxx> 
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?


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